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<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1203140
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<head>
  <title>Test for Bug 1203140</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <script type="application/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
  <script type="application/javascript" src="/tests/SimpleTest/paint_listener.js"></script>
  <script type="application/javascript" src="apz_test_utils.js"></script>
  <script type="application/javascript" src="apz_test_native_event_utils.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
  <style>
  </style>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1203140">Mozilla Bug 1203140</a>
<p id="display"></p>
<div id="content" style="overflow-y:scroll; height: 400px">
  <p>The box below has a touch listener and a passive wheel listener. With touch events disabled, APZ shouldn't wait for any listeners.</p>
  <div id="box" style="width: 200px; height: 200px; background-color: blue"></div>
  <div style="height: 1000px; width: 10px">Div to make 'content' scrollable</div>
</div>
<pre id="test">
<script type="application/javascript">

const kResponseTimeoutMs = 2 * 60 * 1000; // 2 minutes

function takeSnapshots(e) {
  // Grab some snapshots, and make sure some of them are different (i.e. check
  // the page is scrolling in the compositor, concurrently with this wheel
  // listener running).
  // Note that we want this function to take less time than the content response
  // timeout, otherwise the scrolling will start even if we haven't returned,
  // and that would invalidate purpose of the test.
  var start = Date.now();
  var lastSnapshot = null;
  var success = false;

  // Get the position of the 'content' div relative to the screen
  var rect = rectRelativeToScreen(document.getElementById('content'));

  for (var i = 0; i < 10; i++) {
    SpecialPowers.DOMWindowUtils.advanceTimeAndRefresh(16);
    var snapshot = getSnapshot(rect);
    //dump("Took snapshot " + snapshot + "\n"); // this might help with debugging

    if (lastSnapshot && lastSnapshot != snapshot) {
      ok(true, "Found some different pixels in snapshot " + i + " compared to previous");
      success = true;
    }
    lastSnapshot = snapshot;
  }
  ok(success, "Found some snapshots that were different");
  ok((Date.now() - start) < kResponseTimeoutMs, "Snapshotting ran quickly enough");

  // Until now, no scroll events will have been dispatched to content. That's
  // because scroll events are dispatched on the main thread, which we've been
  // hogging with the code above. At this point we restore the normal refresh
  // behaviour and let the main thread go back to C++ code, so the scroll events
  // fire and we unwind from the main test continuation.
  SpecialPowers.DOMWindowUtils.restoreNormalRefresh();
}

function* test(testDriver) {
  var box = document.getElementById('box');

  // Ensure the div is layerized by scrolling it
  yield moveMouseAndScrollWheelOver(box, 10, 10, testDriver);

  box.addEventListener('touchstart', function(e) {
    ok(false, "This should never be run");
  }, false);
  box.addEventListener('wheel', takeSnapshots, { capture: false, passive: true });

  // Let the event regions and layerization propagate to the APZ
  yield waitForAllPaints(function() {
    flushApzRepaints(testDriver);
  });

  // Take over control of the refresh driver and compositor
  var utils = SpecialPowers.DOMWindowUtils;
  utils.advanceTimeAndRefresh(0);

  // Trigger an APZ scroll using a wheel event. If APZ is waiting for a
  // content response, it will wait for takeSnapshots to finish running before
  // it starts scrolling, which will cause the checks in takeSnapshots to fail.
  yield synthesizeNativeMouseMoveAndWaitForMoveEvent(box, 10, 10, testDriver);
  yield synthesizeNativeWheelAndWaitForScrollEvent(box, 10, 10, 0, -50, testDriver);
}

if (isApzEnabled()) {
  SimpleTest.waitForExplicitFinish();
  // Disable touch events, so that APZ knows not to wait for touch listeners.
  // Also explicitly set the content response timeout, so we know how long it
  // is (see comment in takeSnapshots).
  // Finally, enable smooth scrolling, so that the wheel-scroll we do as part
  // of the test triggers an APZ animation rather than doing an instant scroll.
  // Note that this pref doesn't work for the synthesized wheel events on OS X,
  // those are hard-coded to be instant scrolls.
  pushPrefs([["dom.w3c_touch_events.enabled", 0],
             ["apz.content_response_timeout", kResponseTimeoutMs],
             ["general.smoothscroll", true]])
  .then(waitUntilApzStable)
  .then(runContinuation(test))
  .then(SimpleTest.finish);
}

</script>
</pre>

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